What should my friend do?

Mandy and James have been together for about 2years, and things are rocky, they haven't seen each d other or talked in over a mouth. and when they do to talk he is always saying thing like i don't know what you been doing but i know what i have been doing. its her 1st boyfriend and she lost her v-card to him, i know saying bye to him is going to hard. LADIES IF YOU WAS HER WHAT WOULD YOU DO!!